---
title: AI_NoSuchToolError
description: Learn how to fix AI_NoSuchToolError
---

# AI_NoSuchToolError

This error occurs when a model tries to call an unavailable tool.

## Properties

- `toolName`: The name of the tool that was not found
- `availableTools`: Array of available tool names (optional)
- `message`: The error message (optional, auto-generated from `toolName` and `availableTools`)

## Checking for this Error

You can check if an error is an instance of `AI_NoSuchToolError` using:

```typescript
import { NoSuchToolError } from 'ai';

if (NoSuchToolError.isInstance(error)) {
  // Handle the error
}
```